Loans And Allowance For Credit Losses (Summary Of Loans In The Personal Banking Portfolio Percentage Of Balances Outstanding by FICO Score ) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Loans And Allowance For Loan Losses [Line Items]
Credit Quality Personal Real Estate Loans Excluded	$ 170.1	$ 168.9
Consumer Healthcare Loans Excluded	$ 220.5	$ 211.3
Credit quality personal banking loan table percentage loans excluded	7.00%
Real estate - personal
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Real estate - personal | Under 600
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.10%	2.00%
Real estate - personal | 600 - 659
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.30%	2.30%
Real estate - personal | 660 - 719
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	7.30%	8.50%
Real estate - personal | 720 - 779
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	21.60%	21.90%
Real estate - personal | 780 and over
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	66.70%	65.30%
Consumer
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer | Under 600
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.30%	2.50%
Consumer | 600 - 659
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	4.10%	4.30%
Consumer | 660 - 719
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	12.80%	12.90%
Consumer | 720 - 779
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	24.20%	28.20%
Consumer | 780 and over
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	56.60%	52.10%
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Revolving Home Equity [Member] | Under 600
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.00%	1.90%
Revolving Home Equity [Member] | 600 - 659
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	2.90%	3.30%
Revolving Home Equity [Member] | 660 - 719
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	10.50%	10.90%
Revolving Home Equity [Member] | 720 - 779
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	23.40%	22.40%
Revolving Home Equity [Member] | 780 and over
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	61.20%	61.50%
Consumer credit card
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	100.00%	100.00%
Consumer credit card | Under 600
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	4.90%	4.70%
Consumer credit card | 600 - 659
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	12.00%	12.10%
Consumer credit card | 660 - 719
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	29.30%	29.20%
Consumer credit card | 720 - 779
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	26.70%	27.00%
Consumer credit card | 780 and over
Loans And Allowance For Loan Losses [Line Items]
Percentage of Loan Category	27.10%	27.00%